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石安高速公路建设在大宗利用粉煤灰方面取得了一些经验和较好的社会经济效益，用灰量达１１００多万吨，居国内之首。本文试就粉煤灰特性在石安高速公路路基工程中的技术应用作一阐述，以期为推广粉煤灰应用提供技术参考。１ 粉煤灰物理化学性质及其工程特点目前国内较完善的
Shi’an Expressway has gained some experience and good social and economic benefits in the large-scale utilization of fly ash, with the ash content reaching over 11 million tons, ranking first in China. This paper attempts to explain the technical application of fly ash characteristics in the subgrade construction of Shi’an Expressway in order to provide technical reference for the promotion of fly ash application. 1 physical and chemical properties of fly ash and its engineering characteristics at present more perfect